This further confirmed that Sony MDR-Z1R is very picky on an amp. While I feel that most headphones scale logarithmically or linearly at best, but MDR-Z1R to mee seems to scale exponentially. I had Singxer SA-1 for a while as a temporary amp and MDR-Z1R was quite meh experience (while Utopia was still quite good), but when plugged to Bliss, I'm not believing my ears that I'm listening to those cans. While for Utopia it was clear that Bliss was the best amp I had heard, for MDR-Z1R this is very obvious. It's strange how much more I enjoy MDR-Z1R through Bliss than SparkoS Aries. I've mainly used that for meetings (as those are the most comfortable headphones I've ever used) and situations when I want closed cans, but now I'm also actually enjoying them when listening to music, not just as a backup. The only amps I think those have paired nicely with are TA-ZH1ES, Feliks Euforia AE and now Bliss. I'd say that Bliss and Euforia share the first spot for MDR-Z1R, but they are very different (Euforia was very magical with MDR-Z1R, but Bliss is technically in another league, there is a touch of magic as well and the space is massive when the music calls for it).